Donald Trump is now recruiting "Trump Election Observers" to combat what he has called a "rigged" election.

A link on his page — that directs participants to donate — rewards registrants with an email that promises to "do everything we are legally allowed to do to stop crooked Hillary from rigging this election."

The call to action comes less than 24 hours after Trump said Democratic rival Hillary Clinton couldn't win in Pennsylvania unless she cheats and just days after he began inserting voter identification riffs heavily into his stump speech.

Trump is not the first to deploy election observers. In 2008, then-Democratic presidential candidate Barack Obama enlisted "Election Observers" in Pennsylvania to ensure that voters cast their ballots "simply, fairy, and without intimidation."

Trump Booed Leaving New York Times

President Elect Donald Trump is booed as he walks through the lobby of The New York Times Building after a 75-minute meeting with Times journalists. The lobby of the Times building is open to the public, and a large crowd had gathered by the time he departed.

(Published Tuesday, Nov. 22, 2016)

Obama and running mate Joe Biden provided a manual that listed do's and do not's for observers. That sort of guidance has not yet been given by the Trump campaign, which is early on in the recruitment process, NBC News reported.